Improvement in machinery for millstone dressing



A. WOODWGRTH.

Improvement in Machine for'Mi|l'-Stone Dressing.

No.130,265.j I Petented Aug. 6,187.2`r

Wit am: x /g/Z A d a (f f@ fm UNITED STATES PATENT l* OFFICE.

ALFRED wOODwORTII, OE OAMRRIDGE, NEw YORK, AssIeNOR To wILLIAM P.HARWOOD, OF SAME PLAGE.

IMPROVEMENT IN MACHINERY FOR MILLSTONE DRESSING.

Specification forming part of Letters Patent No. 130,265, dated August6, 1872.

' of tool-stock, through which the pitman passes,

so that the upper spring will raise picker and take up stock, while thelower one will prevent its return to the recess of stone, and anyobstruction to a proper clearance thereof.

A in the drawing represents the bed of the machine. B is a sliding frameresting thereon. This sliding frame B is composed Of a transverse frontbar, a, of end pieces b b, and of a horizontal shaft, C. rlhe end piecest in- .to slots or grooves at the ends of the bed A,

which slots or grooves are, preferably, formed by caps el d, fastenedover the ends Of the bed, as shown. The shaft G has its bearings in thepieces b, and carries at one or vboth ends a pinion or pinions, e, whoseteeth match into a toothed rack, f, formed on one of the caps d,

as is clearly shown in Fig. 3. Aratchet-wheel, g, is mounted upon theshaft C, and is in connection with a pawl, h, that is pivoted to aplate, i, swinging on the shaft C. There may be two such plates, i, onenear each end of the shaft C, as shown, and both connected by a rod, j.When the rod j is carried up to swing the plates i the pawl h is made toact on the ratchet-wheel, turning the shaft C, and causing the frame Bto move forward, owing to the contact of the pinion @with the stationaryrack I f. When the frameB has reached the limit of its forward motionthe pawl must be thrown oif the ratchet-wheel in order to permit theframe B to be moved back again, as otherwise the pawl, gearing into theratchet-wheel, prevents the shaft C from turning, and locks the frameBon the rack j. On the bar a and shaft C is supported a carriage, D,which can be moved laterally on its supports, and is provided with asuitable handle,l, whereby it can be moved to one side or the other. Thecarriage D is composed of the base fm, which has the ears that embracethe supports a and C, and of an upright post, n, which contains thebearings of the operating-arbor o and crank-arbor p, both of whicharbors are connected by gearing r. The crank of the arbor p is, by apitman, s, connected with the reciprocating slide and tool-holder E,which is guided between rails t t on the face of the post u. The pitmans ts through a projecting ear of the slide E, and carries springs u u',which bear against opposite sides of said ear, as is clearly shown inFig. l. rjhe effect of the tool on the stone will, consequently, begentle, and not in shocks that would injure the tool, and cause thestone to become splintered or unevenly reduced.

The tool F is, by a screw, V, fastened to the lower part of the slide E,the screw passing through a detachable block, w, and, through a slot inthe tool, into theV slide. The upper end of the tool bears against adetachable block, y, which is, by means of a screw or bolt, m, fastenedto the face of the slide E. The contiguous faces of the slide and blocky are serrated, so that the latter will be vertically sustained on E,and constitute a reliable bearing for the tool F during its descentagainst the stone. During operation, while the tool reciprocates, theframe D is drawn sidewise, to cause a groove to be cut, and at the endof its motion the pawl is brought against the ratchet-wheel to feed theframe B ahead, and cause a new groove to be cut during the subsequentside movement of D.

Hav ing thus described my invention, I claim as new, and desire tosecure by Letters Patent- The combination, with apicker-stock, E, havingfront stud, of a driving-crank pitman, S, passing through and havingsprings u u', one on each side of said stud, as and for the purposedescribed.

ALFRED WOODWORTH.

Witnesses:

J AMEs F. HALL, WARREN NORTON, J R.

